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<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <script>
    var obj = {
      name: 'why',
      age: 18
    }

    // 默认情况下 属性都是没有限制的
    obj.name = ""
    delete obj.name
    console.log(obj.naem)

    // 可以对对象中的属性进行限制
    
    // 属性表述符:Object.defineProperty
    Object.defineProperty()
  </script>
</body>

</html>